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This example was written in answer to the question How to check a check box?

CheckBoxValues.java

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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2019 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/19698771/checking-off-pdf-checkbox-with-itextsharp
 * </code></pre>
 
<p><code class="language-java hljs">* Given a check box in a form, how do we know * which values to use in {@link com.itextpdf.forms.fields.PdfFormField#setValue(String)}? * </code></p>
 
<p><code class="language-java hljs">* This sample differs from the corresponding iText 5 sample. * Here it is described not only how to find out, which values can be set in a checkbox, * but it is also shown that values are settable and it can be verified in the resultant pdf. */ package com.itextpdf.samples.sandbox.acroforms; import com.itextpdf.forms.PdfAcroForm; import com.itextpdf.forms.fields.PdfFormField; import com.itextpdf.kernel.pdf.PdfDocument; import com.itextpdf.kernel.pdf.PdfReader; import com.itextpdf.kernel.pdf.PdfWriter; import java.io.File; import java.util.Map; public class CheckBoxValues { public static final String DEST = "./target/sandbox/acroforms/check_box_values.pdf"; public static final String SRC = "./src/test/resources/pdfs/checkboxExample.pdf"; public static final String CHECKED_FIELD_NAME = "checked"; public static final String UNCHECKED_FIELD_NAME = "unchecked"; public static final String CHECKED_STATE_VALUE = "Yes"; public static final String UNCHECKED_STATE_VALUE = "Off"; public static void main(String[] args) throws Exception { File file = new File(DEST); file.getParentFile().mkdirs(); new CheckBoxValues().manipulatePdf(DEST); } public void manipulatePdf(String dest) throws Exception { PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest)); PdfAcroForm form = PdfAcroForm.getAcroForm(pdfDoc, true); Map fields = form.getFormFields(); PdfFormField checkedField = fields.get(CHECKED_FIELD_NAME); PdfFormField uncheckedField = fields.get(UNCHECKED_FIELD_NAME); // Get array of possible values of the checkbox String[] states = checkedField.getAppearanceStates(); // See all possible values in the console for (String state : states) { System.out.print(state + "; "); } // Search and set checked state to the previously unchecked checkbox and vice versa for (String state : states) { if (state.equals(CHECKED_STATE_VALUE)) { uncheckedField.setValue(state); } else if (state.equals(UNCHECKED_STATE_VALUE)) { checkedField.setValue(state); } } pdfDoc.close(); } } 

CheckBoxValues.cs

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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
 
using System;
using System.Collections.Generic;
using System.IO;
using iText.Forms;
using iText.Forms.Fields;
using iText.Kernel.Pdf;
 
namespace iText.Samples.Sandbox.Acroforms
{
    public class CheckBoxValues
    {
        public static readonly String DEST = "results/sandbox/acroforms/check_box_values.pdf";
 
        public static readonly String SRC = "../../resources/pdfs/checkboxExample.pdf";
 
        public static readonly String CHECKED_FIELD_NAME = "checked";
        public static readonly String UNCHECKED_FIELD_NAME = "unchecked";
 
        public static readonly String CHECKED_STATE_VALUE = "Yes";
        public static readonly String UNCHECKED_STATE_VALUE = "Off";
 
        public static void Main(String[] args)
        {
            FileInfo file = new FileInfo(DEST);
            file.Directory.Create();
 
            new CheckBoxValues().ManipulatePdf(DEST);
        }
 
        public void ManipulatePdf(String dest)
        {
            PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest));
            PdfAcroForm form = PdfAcroForm.GetAcroForm(pdfDoc, true);
            IDictionary fields = form.GetFormFields();
            PdfFormField checkedField = fields[CHECKED_FIELD_NAME];
            PdfFormField uncheckedField = fields[UNCHECKED_FIELD_NAME];
 
            // Get array of possible values of the checkbox
            String[] states = checkedField.GetAppearanceStates();
 
            // See all possible values in the console
            foreach (String state in states)
            {
                Console.Write(state + "; ");
            }
 
            // Search and set checked state to the previously unchecked checkbox and vice versa
            foreach (String state in states)
            {
                if (state.Equals(CHECKED_STATE_VALUE))
                {
                    uncheckedField.SetValue(state);
                }
                else if (state.Equals(UNCHECKED_STATE_VALUE))
                {
                    checkedField.SetValue(state);
                }
            }
 
            pdfDoc.Close();
        }
    }
}

Click the following link to see the legacy example for iText 5. Except for security fixes, iText 5 is no longer being developed.



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